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The effect of molybdenum on γ′ coarsening and on elevated-temperature hardness in some experimental nickel-base superalloys

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Abstract

The coarsening of γ′ and the elevated-temperature hardness have been studied as a function of molybdenum content, time, and temperature in experimental wrought nickel-base superalloys. The alloys were selected from a systematic series containing 3, 4 1/2, and 6 wt pct Al and 1 wt pct Al plus 3 1/2 wt pct Ti. Each of the aluminum (plus titanium) series consisted of four alloys containing 0, 2, 5, and 8 wt pct Mo. The alloys were solution-treated plus aged up to 112 h at 1700°F (925°C) and up to 1000 h at 1400°F (760°C). Molybdenum retards the coarsening of γ′ on aging; this retarding effect is most pronounced in alloys containing 6 wt pct Al. The coarsening of γ′ particles follows Ostwald ripening kinetics. Hardness testingin vacuo at temperatures up to 1750°F (955°C) shows that molybdenum also increases the elevated-temperature hardness significantly. The relation of elevated-temperature hardness to the volume fraction of γ′ is considered, and the influence of aluminum and titanium contents is discussed.

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Authors and Affiliations

  1. Climax Molybdenum Company of Michigan, an AMAX subsidiary, Ann Arbor, Michigan

    V. Biss (Senior Research Associate) & D. L. Sponseller (Research Supervisor)

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  1. V. Biss
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  2. D. L. Sponseller
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Biss, V., Sponseller, D.L. The effect of molybdenum on γ′ coarsening and on elevated-temperature hardness in some experimental nickel-base superalloys. Metall Trans 4, 1953–1960 (1973). https://doi.org/10.1007/BF02665423

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